BWP Switching Method, Apparatus, and Storage Medium

Abstract

The present disclosure relates to a BWP switching method, device, and storage medium. The BWP switching method includes: determining a target BWP to be switched to of the terminal in response to an initial BWP and an independent small data transmission BWP being set in the terminal and the terminal being triggered to enter an inactive state from a connected state, the target BWP including an initial BWP or an independent small data transmission BWP; and switching from an activated BWP to the target BWP. The present disclosure realizes the switching setting of the BWP when entering an inactive state from a connected state.

Description

Technical Field

[0001] The present disclosure relates to the field of communication technologies, and particularly to a BWP switching method, apparatus, and storage medium.

Background Art

[0002] In the design of the new radio (NR) standard, receive bandwidth self - adaptation is introduced. With the receive bandwidth self - adaptation technology, the terminal can monitor the downlink control channel with a small bandwidth and receive a small amount of downlink data transmission. When the terminal receives a large amount of data, the entire bandwidth is released for reception. To better support terminals that cannot process the entire carrier bandwidth and receive bandwidth self - adaptation, the NR standard defines a new concept of bandwidth part (BWP).

[0003] In BWP technology, the network device sets one initial bandwidth part (initial BWP) for a terminal in the idle / inactive state. When the terminal changes from the radio resource control connected (RRC_CONNECTED) state to the radio resource control inactive (RRC_INACTIVE) state, it switches from the activated BWP (active BWP) to the initial BWP. The terminal performs operations such as receiving paging messages, synchronization signal blocks (Synchronization Signal and PBCH block, SSB), system messages, and starting random access with the initial BWP.

[0004] In the discussions of NR Release 17, configured grant small data transmission (SDT) in the inactive state has been proposed. In SDT technology, one independent small data transmission BWP (separate CG-SDT BWP, or separate SDT BWP for short) can be configured for a terminal that supports SDT. When a separate CG-SDT BWP is configured for a terminal that supports SDT, the terminal can perform small data transmission using the separate SDT BWP, thereby meeting the requirements for the transmission bandwidth of small data packets and reducing the congestion in the initial BWP.

[0005] When the network device configures the initial BWP and the separate CG-SDT BWP for the terminal, the terminal enters the inactive state from the connected state, and the problem to be solved is which BWP the terminal should switch to between the initial BWP and the separate CG-SDT BWP.

Summary of the Invention

Problems to be Solved by the Invention

[0006] To overcome the problems existing in the related art, the present disclosure provides a BWP switching method, apparatus, and storage medium.

Means for Solving the Problems

[0007] According to a first aspect of an embodiment of the present disclosure, a BWP switching method applied to a terminal is provided. The BWP switching method includes: in response to an initial BWP and an independent small data transmission BWP being configured for the terminal and the terminal being triggered to enter a non-active state from a connected state, determining a target BWP to be switched for the terminal, where the target BWP includes the initial BWP or the independent small data transmission BWP; and switching from the activated BWP to the target BWP.

[0008] In one embodiment, the step of determining the BWP to be switched for the terminal includes determining, based on a communication protocol, a target BWP for the terminal, where the target BWP is the initial BWP or the independent small data transmission BWP; determining, based on a predefined condition, a target BWP to be switched for the terminal, where the target BWP is the initial BWP or the independent small data transmission BWP; determining, based on indication information for indicating a target BWP to be switched when entering a non-active state from a connected state, a target BWP to be switched for the terminal, where the target BWP is the initial BWP or the independent small data transmission BWP, and including at least one of the above.

[0009] In one embodiment, the target BWP to be switched for the terminal is the initial BWP, and the BWP switching method further includes in response to the existence of small data packets to be transmitted and the timing advance corresponding to the small data transmission being valid, switching from the initial BWP to the independent small data transmission BWP and performing small data transmission based on quasi-static.

[0010] In one embodiment, in response to the synchronization signal block not being set in the independent small data transmission BWP, the step of determining that the timing advance corresponding to the small data transmission is valid is: Based on a first parameter reference value and a first parameter measurement value obtained by measuring the same beam as the first parameter reference value in the initial BWP after entering the non-active state, the step of determining that the timing advance corresponding to the small data transmission is valid, where the first parameter reference value includes a parameter measurement value in the initial BWP or the active BWP before entering the non-active state.

[0011] In one embodiment, in response to the determined switched BWP of the terminal being the initial BWP based on the communication protocol or the indication information and the synchronization signal block being set in the independent small data transmission BWP, the step of determining that the timing advance corresponding to the small data transmission is valid is: Based on a second parameter reference value and a second parameter measurement value obtained by measuring the same beam as the second parameter reference value in the independent small data transmission BWP or the initial BWP after entering the non-active state, the step of determining that the timing advance corresponding to the small data transmission is valid, where the second parameter reference value includes a parameter measurement value in the initial BWP, the independent small data transmission BWP, or the active BWP before entering the non-active state.

[0012] In one embodiment, the BWP switching method further includes a step of switching from the independent small data transmission BWP to the initial BWP in response to the completion of the small data transmission.

[0013] In one embodiment, in response to the target BWP to be switched of the terminal being the independent small data transmission BWP, the method is: In response to the existence of small data packets to be transmitted and the effectiveness of the timing advance for the small data packet transmission, further including the step of performing small data transmission based on quasi-static in the independent small data transmission BWP.

[0014] In one embodiment, the independent small data transmission BWP includes an initial BWP, or one or more parameters among a synchronization signal block, a paging message, a system message, and a random access channel configuration are set in the independent small data transmission BWP. The step of determining that the timing advance corresponding to the small data transmission is effective is based on a third parameter reference value and a third parameter measurement value obtained by measuring the same beam as the third parameter reference value in the independent small data transmission BWP after entering the inactive state, and the step of determining that the timing advance corresponding to the small data transmission is effective, where the third parameter reference value includes a parameter measurement value in the independent small data transmission BWP or the active BWP before entering the inactive state.

[0015] In one embodiment, based on a communication protocol or indication information, it is determined that the target BWP to be switched by the terminal is an independent small data transmission BWP. The independent small data transmission BWP is not set with a synchronization signal block. The step of determining that the timing advance corresponding to the small data transmission is effective is based on a fourth parameter reference value and a fourth parameter measurement value obtained by measuring the same beam as the fourth parameter reference value in the initial BWP after entering the inactive state, and the step of determining that the timing advance corresponding to the small data transmission is effective, where the fourth parameter reference value includes a parameter measurement value in the initial BWP or the active BWP before entering the inactive state.

[0016] In one embodiment, the method includes determining that there are small data packets to be transmitted and determining that the timing advance corresponding to the small data transmission is invalid, and performing small data transmission based on random access in an initial BWP or the independent small data transmission BWP.

[0017] In one embodiment, based on a predefined condition, the step of determining the target BWP to be switched by the terminal includes determining that the condition for switching to an independent small data transmission BWP is satisfied and switching to the independent small data transmission BWP, or determining that the condition for switching to the independent small data transmission BWP is not satisfied and switching to the initial BWP. Satisfying the condition for switching to the independent small data transmission BWP includes that one or more parameters among a synchronization signal block, a paging message, a system message, and a random access channel configuration are set in the independent small data transmission BWP.

[0018] According to a second aspect of the embodiments of the present disclosure, there is provided a BWP switching method applied to a network device. The BWP switching method includes transmitting indication information for indicating a target BWP to be switched when entering from a connected state to a non-active state, where the target BWP includes an initial BWP or an independent small data transmission BWP.

[0019] In one embodiment, the target BWP includes an initial BWP, and no synchronization signal block is set in the independent small data transmission BWP. The method further includes setting, in the initial BWP, beam measurement information that is the same as the beam used for measuring a first parameter reference value, where the first parameter reference value is a parameter measurement value in the initial BWP or an active BWP.

[0020] In one embodiment, the target BWP includes an initial BWP, a synchronization signal block is set for an independent small data transmission BWP, and the method includes setting the same beam measurement information as the beam used for measuring a second parameter reference value for the independent small data transmission BWP, where the second parameter reference value includes parameter measurement values in the initial BWP, the independent small data transmission BWP, or the active BWP before entering the inactive state.

[0021] In one embodiment, the target BWP includes an independent small data transmission BWP, the independent small data transmission BWP includes an initial BWP, or one or more parameters of a synchronization signal block, a paging message, a system message, and a random access channel configuration are set for the independent small data transmission BWP, and the method includes setting the same beam measurement information as the beam used for measuring a third parameter reference value for the independent small data transmission BWP, where the third parameter reference value includes parameter measurement values in the independent small data transmission BWP or the active BWP before entering the inactive state.

[0022] In one embodiment, the target BWP includes an independent small data transmission BWP, a synchronization signal block is not set for the independent small data transmission BWP, and the method includes setting the same beam measurement information as the beam used for measuring a fourth parameter reference value for the initial BWP, where the fourth parameter reference value includes parameter measurement values in the initial BWP or the active BWP before entering the inactive state.

[0023] According to a third aspect of the embodiments of the present disclosure, a BWP switching device is provided. An initial BWP and an independent small data transmission BWP are set for a terminal, and in response to the terminal being triggered to enter from a connected state to an inactive state, a target BWP to be switched for the terminal is determined, the target BWP includes the initial BWP or the independent small data transmission BWP, and a processing unit configured to switch from an activated BWP to the target BWP is included.

[0024] In one embodiment, determining the target BWP to be switched for the terminal includes: determining the target BWP to be switched for the terminal based on a communication protocol; determining the target BWP to be switched for the terminal based on a predefined condition; and determining the target BWP to be switched for the terminal based on indication information for indicating the target BWP to be switched when entering from a connected state to an inactive state, including at least one of them.

[0025] In one embodiment, the target BWP is the initial BWP, and the processing unit further determines that there is a small data packet to be transmitted, determines that a timing advance corresponding to the small data transmission is valid, and is configured to switch from the initial BWP to an independent small data transmission BWP to perform small data transmission based on quasi-static.

[0026] In one embodiment, no synchronization signal block is set for the independent small data transmission BWP, and the processing unit is configured to determine that the timing advance corresponding to the small data transmission is valid based on a first parameter reference value and a first parameter measurement value obtained by measuring the same beam as the first parameter reference value in the initial BWP after entering the inactive state, and the first parameter reference value includes a parameter measurement value in the initial BWP or the active BWP before entering the inactive state.

[0027] In one embodiment, based on a communication protocol or instruction information, it is determined that the target BWP to be switched by the terminal is the initial BWP, a synchronization signal block is set for the independent small data transmission BWP, and the processing unit is configured to determine that the timing advance corresponding to the small data transmission is valid based on a second parameter reference value and a second parameter measurement value obtained by measuring a beam same as the second parameter reference value in the independent small data transmission BWP or the initial BWP after entering the inactive state, and the second parameter reference value includes parameter measurement values in the initial BWP, the independent small data transmission BWP, or the active BWP before entering the inactive state.

[0028] In one embodiment, the processing unit further determines that the small data transmission is completed and switches from the independent small data transmission BWP to the initial BWP.

[0029] In one embodiment, the target BWP is the independent small data transmission BWP, and the processing unit further determines that there is a small data packet to be transmitted, determines that the timing advance corresponding to the small data transmission is valid, and is configured to perform small data transmission based on quasi-static in the independent small data transmission BWP.

[0030] In one embodiment, the independent small data transmission BWP includes an initial BWP, or one or more parameters among a synchronization signal block, a paging message, a system message, and a random access channel configuration are set in the independent small data transmission BWP. The processing unit is configured to determine that the timing advance corresponding to the small data transmission is valid based on a third parameter reference value and a third parameter measurement value obtained by measuring the same beam as the third parameter reference value in the independent small data transmission BWP after entering the inactive state. The third parameter reference value includes a parameter measurement value in the independent small data transmission BWP or the active BWP before entering the inactive state.

[0031] In one embodiment, based on a communication protocol or instruction information, it is determined that the target BWP to be switched by the terminal is an independent small data transmission BWP, and no synchronization signal block is set in the independent small data transmission BWP. The processing unit is configured to determine that the timing advance corresponding to the small data transmission is valid based on a fourth parameter reference value and a fourth parameter measurement value obtained by measuring the same beam as the fourth parameter reference value in the initial BWP after entering the inactive state. The fourth parameter reference value includes a parameter measurement value in the initial BWP or the active BWP before entering the inactive state.

[0032] In one embodiment, the processing unit determines that there is a small data packet to be transmitted, determines that the timing advance corresponding to the small data transmission is invalid, and is configured to perform small data transmission based on random access in the initial BWP or the independent small data transmission BWP.

[0033] In one embodiment, the processing unit determines that the conditions for switching to an independent small data transmission BWP are met, and determines a method for switching to the independent small data transmission BWP, or determines that the conditions for switching to the independent small data transmission BWP are not met, and determines a method for switching to the initial BWP. Based on predefined conditions, the processing unit is configured to determine the target BWP to be switched for the terminal. Meeting the conditions for switching to the independent small data transmission BWP includes that one or more parameters among a synchronization signal block, a paging message, a system message, and a random access channel configuration are set in the independent small data transmission BWP.

[0034] According to a fourth aspect of the embodiments of the present disclosure, a BWP switching device is provided, including a transmission unit configured to transmit instruction information for instructing a target BWP to be switched when entering from a connected state to a non-active state, where the target BWP includes an initial BWP or an independent small data transmission BWP.

[0035] In one embodiment, the BWP switching device further includes a processing unit, the target BWP includes an initial BWP, no synchronization signal block is set in the independent small data transmission BWP, and the processing unit is configured to set the same beam measurement information as the beam used for measuring the first parameter reference value in the initial BWP, where the first parameter reference value is a parameter measurement value in the initial BWP or an active BWP.

[0036] In one embodiment, the BWP switching device further includes a processing unit, the target BWP includes an initial BWP, a synchronization signal block is set for the independent small data transmission BWP, and the processing unit is configured to set the same beam measurement information as the beam used for measuring the second parameter reference value in the independent small data transmission BWP, and the second parameter reference value includes parameter measurement values in the initial BWP, the independent small data transmission BWP, or the active BWP before entering the inactive state.

[0037] In one embodiment, the BWP switching device further includes a processing unit, the target BWP includes an independent small data transmission BWP, the independent small data transmission BWP includes an initial BWP, or one or more parameters among a synchronization signal block, a paging message, a system message, and a random access channel configuration are set for the independent small data transmission BWP, and the processing unit is configured to set the same beam measurement information as the beam used for measuring the third parameter reference value in the independent small data transmission BWP, and the third parameter reference value includes parameter measurement values in the independent small data transmission BWP or the active BWP before entering the inactive state.

[0038] In one embodiment, the BWP switching device further includes a processing unit, the target BWP includes an independent small data transmission BWP, a synchronization signal block is not set for the independent small data transmission BWP, and the processing unit is configured to set the same beam measurement information as the beam used for measuring the fourth parameter reference value in the initial BWP, and the fourth parameter reference value includes parameter measurement values in the initial BWP or the active BWP before entering the inactive state.

[0039] According to a fifth aspect of the embodiments of the present disclosure, a BWP switching device is provided, including a processor and a memory for storing instructions executable by the processor. The processor is configured to execute the BWP switching method described in any one embodiment of the first aspect or the first aspect.

[0040] According to a sixth aspect of an embodiment of the present disclosure, a BWP switching device is provided, and the device includes: a processor and a memory for storing instructions executable by the processor, the processor is configured to execute the BWP switching method described in any one embodiment of the second aspect or the second aspect.

[0041] According to a seventh aspect of an embodiment of the present disclosure, a storage medium storing instructions is provided. When the instructions in the storage medium are executed by a processor of a terminal, the terminal is caused to execute the BWP switching method described in any one embodiment of the first aspect or the first aspect.

[0042] According to an eighth aspect of an embodiment of the present disclosure, a storage medium storing instructions is provided. When the instructions in the storage medium are executed by a processor of a network device, the network device is caused to execute the BWP switching method described in any one embodiment of the second aspect or the second aspect.

Advantages of the Invention

[0043] The technical solution provided by the embodiments of the present disclosure can achieve the following beneficial effects. The terminal is triggered to enter from a connected state to an inactive state, switches from an activated BWP to an initial BWP or an independent small data transmission BWP, and realizes the BWP switching setting when entering from a connected state to an inactive state.

[0044] It should be noted that the above general description and the following detailed description are exemplary and explanatory, and do not limit the present disclosure.

Brief Description of the Drawings

[0045] The drawings herein are incorporated in and form a part of the specification, showing embodiments consistent with the present disclosure and used to explain the principles of the present disclosure together with the specification.

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DETAILED DESCRIPTION OF THE INVENTION

[0046] Here, exemplary embodiments will be described, and the examples are shown in the drawings. In the following description, when it is related to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments that conform to the present disclosure.

[0047] The access method provided by the embodiments of the present disclosure can be applied to the wireless communication system shown in FIG. 1. As shown in FIG. 1, the wireless communication system includes a terminal and a network device. Information can be transmitted and received between the terminal and the network device via wireless resources.

[0048] Note that the wireless communication system shown in FIG. 1 is only an exemplary description, and the wireless communication system may include other network devices, for example, a core network device, a wireless relay device, and a wireless backhaul device, etc. (not shown in FIG. 1). The embodiments of the present disclosure do not limit the number of network devices and the number of terminals included in the wireless communication system.

[0049] The wireless communication system of the embodiments of the present disclosure is a network that provides a wireless communication function. The wireless communication system can use different communication technologies such as, for example, code division multiple access (CDMA), wideband code division multiple access (WCDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency-division multiple access (OFDMA), single Carrier FDMA (SC-FDMA), Carrier Sense Multiple Access with Collision Avoidance. Based on factors such as the capacity, speed, and delay of different networks, the network can be divided into future evolved networks such as 2G (generation in English) networks, 3G networks, 4G networks, or 5G networks, also known as New Radio (NR). For ease of explanation, in the present disclosure, the wireless communication network may sometimes be abbreviated as the network.

[0050] Furthermore, the network device according to the present disclosure is also referred to as a wireless access network device. The wireless access network device may be a base station, an evolved node B (eNB), a home base station, an access point (AP) in a wireless fidelity (WIFI) system, a wireless relay node, a wireless backhaul node, a transmission point (TP), or a transmission and reception point (TRP), etc., or may be a gNB in an NR system, or may be a component or a part of a device that constitutes a base station. In the case of a vehicle-to-everything (V2X) communication system, the network device may be an in-vehicle device. Note that in the embodiments of the present disclosure, the specific technologies and specific device forms used by the network device are not limited.

[0051] Furthermore, the terminal according to the present disclosure may also be referred to as a terminal device, a user equipment (UE), a mobile station (MS), a mobile terminal (MT), etc., and is a device that provides voice and / or data connectivity to a user. For example, the terminal may be a handheld device with a wireless connection function, an in-vehicle device, etc. Currently, as examples of some terminals, there are mobile phones, pocket personal computers (PPCs), personal digital assistants, personal digital assistants (PDAs), notebook computers, tablets, wearable devices, or in-vehicle devices. Also, in the case of a vehicle-to-everything (V2X) communication system, the terminal device may further be an in-vehicle device. Note that in the embodiments of the present disclosure, the specific technologies and specific device forms used by the terminal are not limited.

[0052] In related technologies, the terminal state may include a connected state (also referred to as the CONNCETED state or the RRC_CONNCETED state), an inactive state (also referred to as the inactive state or the RRC_INACTIVE state), and an idle state (also referred to as the idle state or the RRC_IDLE state). In the discussion of NR release 17, it is proposed to support SDT transmission in the inactive state. SDT transmission may be understood as data transmission that can be completed without entering the connected state, thereby avoiding waste of time-frequency resources, shortening the delay of data transmission, and reducing the energy consumption of the terminal.

[0053] SDT transmission includes SDT based on the random access process and SDT based on quasi-static (Also called Configured Grant SDT or CG SDT)Supports two types of methods. SDT based on the random access process allows the terminal to transmit uplink small data packets in the Physical Uplink Shared Channel (PUSCH) of message A (msgA) or message 3 (msg3) through a two-step random access or a four-step random access. SDT based on quasi-static conditions means that when the network device is converted from the connected state to the inactive state, information such as resource allocation information in the quasi-static time-frequency domain required for SDT transmission and the determination of the validity of Timing Advance (TA) is carried in the RRC release message. When the terminal has uplink data to transmit in the inactive state, it first makes determinations on the validity of TA, the Synchronization Signal Reference Signal Received Power (SS-RSRP), and the data packet size. When all conditions such as the validity of TA, SS-RSRP, and the data packet size are met, small data transmission is performed using the quasi-static resources set by the network device. Otherwise, for example, when the size of the uplink data packet the terminal attempts to transmit exceeds the threshold, the terminal executes a four-step random access process to enter the connected state and performs data transmission in the connected state.

[0054] Furthermore, in a 4G network, by default, all terminals can handle a carrier bandwidth of 20 MHz. This strict indicator increases the cost of 4G terminals, but it can disperse the frequency domain resources occupied by the transmission channel across the entire bandwidth and obtain a frequency diversity gain. Since 5G NR needs to support a very large system bandwidth (up to 400 MHz), it is inevitably unreasonable to let all different terminals receive the entire bandwidth. For example, data transmission in the Internet of Things usually requires a smaller bandwidth. In the 5G NR standard design, the following two factors need to be considered. 1) It is not necessary for all terminals to have the ability to receive the entire carrier bandwidth. In the NR standard, a special design needs to be introduced to handle terminals with different bandwidth capabilities. 2) If all terminals are to be able to receive the entire carrier bandwidth, not only the cost of the terminals but also the increase in power consumption due to the entire system bandwidth should be considered as an important factor.

[0055] Therefore, in the NR standard design, a new technology called receive bandwidth self - adaptation has been introduced. With the receive bandwidth self - adaptation technology, when the amount of data to be transmitted is small, the terminal can monitor the downlink control channel with a small bandwidth and receive a small amount of downlink data transmission. When the terminal receives a large amount of data, it opens a larger bandwidth for reception. To better support terminals that cannot process the entire carrier bandwidth and receive bandwidth self - adaptation, BWP is defined in the NR standard.

[0056] Furthermore, in the NR protocol, it is stipulated that the network device can set up to four BWPs for the connection state, and at the same time, the switching of BWPs can be carried out by means of downlink control information (DCI), a switch timer, and a quasi - static setting method. When the amount of data is small, a narrow BWP can be used as the active BWP, and data packet transmission can be carried out with the active BWP. When the amount of data is large, it can be switched to a wider BWP via DCI, and data transmission can be carried out with the wider BWP.

[0057] Also, in the related technology, the network device further sets one initial BWP for the IDLE / inactive state terminals. When the terminal changes from the connected state to the inactive state, it switches from the active BWP to the initial BWP. Figure 2 shows a schematic diagram of switching from the active BWP to the initial BWP. The terminal receives paging messages, SSBs, and system messages with the initial BWP and starts random access, etc.

[0058] Furthermore, in Release 17 SDT WI, it is proposed to configure one separate SDT BWP for CG-SDT. When a separate SDT BWP is configured for a terminal supporting SDT, the terminal can perform small data transmission using the separate SDT BWP, thereby meeting the needs of the transmission bandwidth of small data packets and reducing the degree of congestion in the initial BWP.

[0059] However, when the network device configures the initial BWP and the separate CG-SDT BWP for the terminal, when the terminal enters from the connected state to the inactive state, there is currently no discussion on which BWP the terminal should switch to among the initial BWP and the separate CG-SDT BWP.

[0060] In view of this, the embodiments of the present disclosure provide a BWP switching method for determining the target BWP to be switched when the terminal enters from the connected state to the inactive state.

[0061] The BWP switching method provided by the embodiments of the present disclosure is applicable to a communication scenario where the initial BWP and the separate CG-SDT BWP are configured for the terminal and the terminal enters from the connected state to the inactive state. FIG. 3 shows a schematic diagram of a communication scenario where the initial BWP and the separate CG-SDT BWP are configured and the terminal enters from the connected state to the inactive state.

[0062] In the embodiments of the present disclosure, for a terminal with the initial BWP and the separate CG-SDT BWP configured, by providing a BWP switching method, it is determined whether the BWP to be switched when the terminal enters from the connected state to the inactive state is the initial BWP or the separate CG-SDT BWP.

[0063] FIG. 4 is a flowchart of a BWP switching method shown by an exemplary embodiment. As shown in FIG. 4, the BWP switching method is applied to a terminal and includes the following steps S11 to S13.

[0064] In step S11, it is determined that an initial BWP and a separate CG-SDT BWP are set for the terminal, and the terminal is triggered to enter from a connected state to a non-active state.

[0065] In step S12, a target BWP to be switched by the terminal is determined, and the target BWP includes the initial BWP or the separate CG-SDT BWP.

[0066] In step S13, switch from the active BWP to the initial BWP or the separate CG-SDT BWP.

[0067] In an embodiment of the present disclosure, in response to the fact that an initial BWP and a separate CG-SDT BWP are set for the terminal and the terminal is triggered to enter from a connected state to a non-active state, it is determined to switch to the initial BWP or the separate CG-SDT BWP, whereby the activated BWP is switched to the initial BWP or the separate CG-SDT BWP.

[0068] It should be noted that the above-mentioned steps S11 and S12 may be executed simultaneously, or may be executed before and after in any order. The embodiments of the present disclosure do not limit the slots in which the two steps are executed.

[0069] In one embodiment, in the embodiments of the present disclosure, when determining whether the target BWP to be switched by the terminal is the initial BWP or the separate CG-SDT BWP, at least one of the following methods 1 to 3 may be used.

[0070] In method 1, based on the communication protocol, determine the target BWP to which the terminal is to be switched.

[0071] In one example, the communication protocol stipulates that when a terminal (exemplarily including a terminal supporting SDT transmission and a terminal not supporting SDT) enters the non-active state from the connected state, it always switches to the initial BWP. That is, based on the communication protocol, determine that the target BWP to which the terminal is to be switched is the initial BWP.

[0072] In another example, the communication protocol stipulates that when a terminal supporting SDT enters the non-active state from the connected state, it switches to the separate CG-SDT BWP. That is, based on the communication protocol, determine that the target BWP to which the terminal is to be switched is the separate CG-SDT BWP.

[0073] In method 2, based on the predefined conditions, determine the target BWP to which the terminal is to be switched.

[0074] Here, the predefined conditions may include the condition for switching to the separate CG-SDT BWP and / or the condition for switching to the initial BWP. Of course, it may include only one of them. A terminal that meets the condition switches to the corresponding target BWP, and a terminal that does not meet the condition may switch to another target BWP.

[0075] In one example, the pre-defined conditions include the conditions for switching to a separate CG-SDT BWP. Here, the conditions for switching to a separate CG-SDT BWP include that SSB, paging message, system message, and random access channel configuration are set in the separate CG-SDT BWP. In one aspect, the terminal determines that the conditions for switching to a separate CG-SDT BWP are met and switches to the separate CG-SDT BWP. Or, in another aspect, the terminal determines that the conditions for switching to a separate CG-SDT BWP are not met and switches to the initial BWP or another BWP.

[0076] In another example, the pre-defined conditions include the conditions for switching to the initial BWP. Here, the conditions for switching to the initial BWP include that SSB, paging message, system message, and random access channel configuration are not set in the initial BWP. In one aspect, the terminal determines that the conditions for switching to the initial BWP are met and switches to the initial BWP. In another aspect, the terminal determines that the conditions for switching to the initial BWP are not met and switches to the separate CG-SDT BWP.

[0077] In another example, the pre-defined conditions include the conditions for switching to the initial BWP and the conditions for switching to the separate CG-SDT BWP. Here, for the conditions for switching to the initial BWP and the conditions for switching to the separate CG-SDT BWP, please refer to the above description. In one aspect, the terminal determines that the conditions for switching to the initial BWP are met and switches to the initial BWP. The terminal determines that the conditions for switching to the separate CG-SDT BWP are met and switches to the separate CG-SDT BWP. The terminal determines that the above two conditions are not met and switches to another BWP.

[0078] In an embodiment of the present disclosure, determining a target BWP to be switched by a terminal based on a pre-defined condition may be understood as a method of implicitly determining the target BWP to be switched. For example, in an implicit manner, when the terminal enters the non-active state from the connected state, it is determined that the terminal switches to the separate CG-SDT BWP. For example, when the network device sets parameters required for one or more processes such as SSB, paging, system message reception, and random access channel (RACH) process for the separate CG-SDT BWP, the terminal supporting SDT switches to the separate CG-SDT BWP, and otherwise, switches to the initial BWP.

[0079] In Method 3, based on the indication information for indicating the target BWP to be switched when entering the non-active state from the connected state, the target BWP to be switched by the terminal is determined.

[0080] In an embodiment of the present disclosure, the network device can indicate to the terminal which BWP to switch to when entering the non-active state from the connected state according to the indication information. In one aspect, the indication information can indicate that the terminal switches to the initial BWP when entering the non-active state from the connected state. In this case, in response to the terminal entering the non-active state from the connected state, the terminal determines to switch to the initial BWP based on the indication information. In another aspect, the indication information can indicate that the terminal switches to the separate CG-SDT BWP when entering the non-active state from the connected state. In this case, in response to the terminal entering the non-active state from the connected state, the terminal determines to switch to the separate CG-SDT BWP based on the indication information.

[0081] In one example, the indication information for instructing the terminal to switch to a target BWP that can be switched when entering the non-active state from the connected state may be one information element of the existing signaling. For example, it may be indicated by RRC release signaling, or may be indicated by the indication information for instructing BWP switching transmitted from the network device in the SDT execution process.

[0082] In the embodiments of the present disclosure, when a separate CG-SDT BWP and an initial BWP are set in the terminal, the terminal uses any one of the above-described Embodiment 1, Embodiment 2, and Embodiment 3 to determine the target BWP when entering the non-active state from the connected state, and can switch from the activated BWP to the determined target BWP.

[0083] In the BWP switching method provided by the embodiments of the present disclosure, the terminal can perform SDT transmission. Here, the SDT transmission includes SDT transmission based on quasi-static, or SDT transmission based on random access.

[0084] In the BWP switching method provided by the embodiments of the present disclosure, the terminal needs to determine the TA validity before or at the same time as performing the SDT transmission.

[0085] In one embodiment, when the current BWP is the initial BWP, if the terminal determines that there is a small data packet to be transmitted and determines that the timing advance corresponding to the SDT transmission is valid, it switches from the initial BWP to the separate CG-SDT BWP and performs SDT transmission based on quasi-static.

[0086] Figure 5A is a flowchart of SDT transmission shown by an exemplary embodiment. This method may be implemented alone or in combination with other methods of the embodiments of the present disclosure, and is not limited in the embodiments of the present disclosure. For example, an exemplary embodiment of this method may be implemented in combination with the embodiment shown in FIG. 4 described above, or may be implemented in combination with subsequent embodiments. As shown in FIG. 5A, the SDT transmission method is applied to a terminal and includes the following steps.

[0087] In step S21, it is determined that the current BWP is the initial BWP.

[0088] In step S22a, it is determined that there is a small data packet to be transmitted, and it is determined that the timing advance corresponding to SDT transmission is valid.

[0089] In step S23a, switch from the initial BWP to the separate CG-SDT BWP and perform SDT transmission based on quasi-static.

[0090] In another embodiment of the embodiments of the present disclosure, when the current BWP is the initial BWP and the terminal determines that there is a small data packet to be transmitted and the timing advance corresponding to SDT transmission is invalid, SDT transmission based on random access is performed in the initial BWP or the separate CG-SDT BWP.

[0091] Figure 5B is a flowchart of SDT transmission shown by an exemplary embodiment. This method may be implemented alone or in combination with other methods of the embodiments of the present disclosure, and is not limited in the embodiments of the present disclosure. For example, an exemplary embodiment of this method may be implemented in combination with the embodiment shown in FIG. 4 described above, or may be implemented in combination with subsequent embodiments. As shown in FIG. 5B, the SDT transmission method is applied to a terminal and includes the following steps.

[0092] In step S21, it is determined that the current BWP is the initial BWP.

[0093] In step S22b, it is determined that there is a small data packet to be transmitted, and it is determined that the timing advance corresponding to SDT transmission is invalid.

[0094] In step S23b, SDT transmission based on random access is performed in the initial BWP or the separate CG-SDT BWP.

[0095] In one embodiment, the current BWP is the separate CG-SDT BWP. In one aspect, when the terminal determines that there is a small data packet to be transmitted and determines that the timing advance corresponding to SDT transmission is valid, SDT transmission based on quasi-static is performed in the separate CG-SDT BWP.

[0096] FIG. 6A is a flowchart of SDT transmission shown by an exemplary embodiment. This method may be implemented alone or in combination with other methods of the embodiments of the present disclosure, and is not limited in the embodiments of the present disclosure. For example, an exemplary embodiment of this method may be implemented together with the embodiment shown in FIG. 4 described above, or together with subsequent embodiments. As shown in FIG. 6A, the method of SDT transmission is applied to a terminal and includes the following steps.

[0097] In step S31, it is determined that the current BWP is the separate CG-SDT BWP.

[0098] In step S32a, it is determined that there is a small data packet to be transmitted, and it is determined that the timing advance corresponding to SDT transmission is valid.

[0099] In step S33a, SDT transmission based on quasi-static is performed in the separate CG-SDT BWP.

[0100] In another embodiment of the embodiments of the present disclosure, when the terminal determines that there is a small data packet to be transmitted and determines that the timing advance corresponding to SDT transmission is invalid, it performs SDT transmission based on random access in the initial BWP or the separate CG-SDT BWP.

[0101] Figure 6B is a flowchart of SDT transmission shown by an exemplary embodiment. This method may be implemented alone or in combination with other methods of the embodiments of the present disclosure, and is not limited in the embodiments of the present disclosure. For example, an exemplary embodiment of this method may be implemented together with the embodiment shown in FIG. 4 described above, or may be implemented together with subsequent embodiments. As shown in FIG. 6B, the SDT transmission method is applied to a terminal and includes the following steps.

[0102] In step S31, it is determined that the current BWP is the separate CG-SDT BWP.

[0103] In step S32b, it is determined that there is a small data packet to be transmitted and it is determined that the timing advance corresponding to SDT transmission is invalid.

[0104] In step S33b, SDT transmission based on random access is performed in the initial BWP or the separate CG-SDT BWP.

[0105] In the BWP switching method provided by the embodiments of the present disclosure, during the implementation of the method for the terminal to perform SDT transmission, when the terminal enters from the connected state to the inactive state, the terminal determines the current BWP based on the target BWP that can be switched, determines the TA validity, and can perform SDT transmission.

[0106] In the embodiments of the present disclosure, first, an example will be described in which the target BWP that can be switched when the terminal enters from the connected state to the inactive state is the initial BWP.

[0107] In one embodiment of the embodiments of the present disclosure, it is determined that when the terminal enters the inactive state from the connected state, it always switches to the initial BWP based on the communication protocol specification. Or it is determined that when the terminal enters the inactive state from the connected state, it switches to the initial BWP based on pre-defined conditions. Or it is determined that when the terminal enters the inactive state from the connected state, it switches to the initial BWP based on the indication information.

[0108] When the terminal switches to the initial BWP when entering the inactive state from the connected state, in response to the existence of small data packets to be transmitted to the terminal, the terminal switches from the initial BWP to the separate CG-SDT BWP for transmission. If there is no SDT transmission currently, it always stays in the initial BWP. Also, before the terminal performs SDT transmission, the TA validity is determined by performing SSB measurement.

[0109] In the embodiments of the present disclosure, when the terminal enters the inactive state from the connected state and switches to the initial BWP, different TA validity determination methods may be used based on whether an SSB is set in the separate CG-SDT BWP.

[0110] In one embodiment, when the terminal enters the non-active state from the connected state and determines to switch to the initial BWP based on a communication protocol, predefined conditions, or indication information, and no SSB is configured for the separate CG-SDT BWP, the terminal performs SSB measurement in the initial BWP, and uses the measured parameter value obtained from the measurement as the parameter reference value for later TA validity determination. Hereinafter, the parameter reference value is referred to as the first parameter reference value. After switching from the connected state to the non-active state and before performing SDT transmission, the terminal measures the parameter value of the same beam as the first parameter reference value in the initial BWP. Hereinafter, it is referred to as the first parameter measurement value. Based on the first parameter reference value and the first parameter measurement value, it is determined whether the timing advance corresponding to the SDT transmission is valid.

[0111] In one example, the case where the parameter obtained by performing the SSB measurement is the RSRP will be described as an example. The terminal performs the SSB measurement in the initial BWP and holds the obtained RSRP value as the reference value. Here, the terminal performs the SSB measurement in the initial BWP to determine the RSRP value used as the reference value, which may be performed before entering the non-active state, or may be performed simultaneously with or after entering the non-active state.

[0112] For example, before entering the inactive state, the terminal switches to the initial BWP to perform SSB measurement, and retains the obtained RSRP value as a reference value. The terminal switches from the connected state to the inactive state. Before the terminal starts SDT in the inactive state, it measures the RSRP value of the same SSB subset as that used during the measurement of the RSRP reference value in the initial BWP as a measured value. Or, the terminal switches from the connected state to the inactive state. In the inactive state, the terminal switches to the initial BWP, performs SSB measurement in the initial BWP, and retains the obtained RSRP value as a reference value. Before the terminal starts SDT in the inactive state, the terminal performs SSB measurement in the initial BWP again, and measures the RSRP value of the same SSB subset as that used during the measurement of the RSRP reference value as a measured value.

[0113] The terminal determines whether the TA is valid by comparing the measured value with the reference value. On the premise that the TA is valid, it switches to the separate CG-SDT BWP to perform SDT transmission. Otherwise, on the premise that the SDT transmission conditions are met, RA-based SDT is performed in the initial BWP.

[0114] In another aspect, the terminal enters from the connected state into the inactive state, determines to switch to the initial BWP based on a communication protocol, predefined conditions or indication information, and when no SSB is configured for the separate CG-SDT BWP, the terminal performs SSB measurement on the activated BWP, uses the measured parameter value obtained from the measurement as a parameter reference value for later TA validity determination, and hereinafter continues to refer to this parameter reference value as the first parameter reference value. Here, to ensure that the terminal performs SSB measurement with the same beam, the network device sets the same beam measurement information as the beam used for the measurement of the first parameter reference value in the initial BWP. The terminal switches from the connected state to the inactive state. It measures the parameter value of the same beam as the first parameter reference value in the initial BWP, and hereinafter continues to refer to this as the first parameter measurement value. That is, based on the first parameter reference value and the first parameter measurement value, it is determined whether the timing advance corresponding to SDT transmission is valid.

[0115] In one example, a case where the parameter obtained by performing the SSB measurement is the RSRP will be described as an example. Before entering the inactive state, the terminal first performs an SSB measurement in the activated BWP, and uses the measured RSRP as a reference value. Also, the network device sets, for each terminal, a measurement quantity such as an individual SSB subset beam that is the same as the reference value in the initial BWP through high-level signaling. That is, the network device sets the same beam measurement information as the beam used for the measurement of the first parameter reference value in the initial BWP. In response to the terminal entering the inactive state and the terminal attempting to start SDT, first, the network device-verified SSB measurement set in the initial BWP is measured to verify the TA validity. For example, the same SSB subset as that used during the measurement of the RSRP reference value is measured. The terminal determines whether the TA is valid by comparing the measured value with the reference value. On the premise that the TA is valid, the terminal switches to the separate CG-SDT BWP and performs SDT transmission. Otherwise, on the premise that the SDT transmission condition is satisfied, RA-based SDT is performed in the initial BWP.

[0116] In an embodiment of the present disclosure, when the terminal switches from the connected state to the inactive state, determines that the target BWP to which the terminal is switched based on the communication protocol or the instruction information is the initial BWP, and the SSB is set in the separate CG-SDT BWP, the terminal performs an SSB measurement in the initial BWP, the separate CG-SDT BWP, or the active BWP, and uses the measured parameter measurement value as a parameter reference value for later determining the TA validity. Hereinafter, the parameter reference value is referred to as a second parameter reference value. Before the terminal switches from the connected state to the inactive state and executes SDT transmission, the terminal measures the parameter value of the same beam as the second parameter reference value in the initial BWP or the separate CG-SDT BWP. Hereinafter, it is referred to as a second parameter measurement value. That is, based on the second parameter reference value and the second parameter measurement value, it is determined whether the timing advance corresponding to the SDT transmission is valid.

[0117] Here, the terminal enters from the connected state to the inactive state. Based on the communication protocol or instruction information, it is determined that the target BWP to which the terminal is switched is the initial BWP. When an SSB is set for the separate CG-SDT BWP, the SSB in the initial BWP may be measured to obtain the second parameter measurement value, or the SSB in the separate CG-SDT BWP may be measured to obtain the second parameter measurement value. When measuring the SSB in the initial BWP to obtain the second parameter measurement value, specifically, when no SSB is set for the separate CG-SDT BWP in the above embodiment, reference may be made to the execution process of measuring the SSB in the initial BWP, and detailed description is omitted here. Hereinafter, a process of measuring the SSB in the separate CG-SDT BWP to obtain the second parameter measurement value and determining whether the timing advance corresponding to the SDT transmission is valid based on the second parameter reference value and the second parameter measurement value will be described.

[0118] In one example, a case where the parameter obtained by executing the SSB measurement is the RSRP will be described as an example. Here, for the terminal to execute the SSB measurement in the separate CG-SDT BWP to determine the RSRP value used as the reference value, it may be executed before entering the inactive state, or may be executed simultaneously with or after entering the inactive state.

[0119] For example, before the terminal enters the inactive state, it switches to the separate CG-SDT BWP to perform SSB measurement and holds the obtained RSRP value as a reference value. The terminal enters the inactive state from the connected state and switches from the separate CG-SDT BWP to the initial BWP. Before performing SDT transmission in the inactive state, the terminal first switches to the separate CG-SDT BWP to perform SSB measurement and measures the RSRP value of the same SSB subset as that used during the measurement of the RSRP reference value as a measurement value. Alternatively, the terminal switches from the connected state to the inactive state, switches to the separate CG-SDT BWP in the inactive state to perform SSB measurement, and holds the obtained RSRP value as a reference value. In the inactive state, the terminal switches from the separate CG-SDT BWP to the initial BWP. Before the terminal starts SDT, the terminal switches to the separate CG-SDT BWP again to perform SSB measurement and measures the RSRP value of the same SSB subset as that used during the measurement of the RSRP reference value as a measurement value.

[0120] The terminal determines whether the TA is valid by comparing the measurement value with the reference value. SDT transmission is performed on the premise that the TA is valid. Otherwise, on the premise that the SDT transmission conditions are met, it checks whether there are random access resources in the separate CG-SDT BWP. If there are random access resources in the separate CG-SDT BWP, SDT transmission based on random access is performed in the separate CG-SDT BWP. If there are no random access resources in the separate CG-SDT BWP, it switches to the initial BWP to perform SDT transmission based on random access.

[0121] In another example, a case where the parameter obtained by performing the SSB measurement is the RSRP will be described. Before the terminal enters the inactive state, first, perform the SSB measurement in the activated BWP, and use the measured RSRP as the reference value. At the same time, the network device sets the measurement quantity such as the SSB beam, which is the same as the reference value, to a separate CG-SDT BWP through high-level signaling. That is, for the independent small data transmission BWP, the same beam measurement information as the beam used for the measurement of the second parameter reference value is set. The terminal enters the inactive state and switches to the initial BWP. When it is determined that SDT transmission is required, first, switch from the initial BWP to the separate CG-SDT BWP, and at the same time, measure the measurement quantity set by the network device to perform TA validity determination. Perform SDT transmission on the premise that the TA is valid. Otherwise, on the premise that the SDT transmission conditions are met, determine whether there is a random access resource in the separate CG-SDT BWP. If there is a random access resource in the separate CG-SDT BWP, perform SDT transmission based on random access in the separate CG-SDT BWP. If there is no random access resource in the separate CG-SDT BWP, switch to the initial BWP and perform SDT transmission based on random access.

[0122] In the BWP switching method provided by the above embodiment of the present disclosure, based on the communication protocol or the indication information, it is determined that the target BWP to be switched by the terminal is the initial BWP, perform SDT transmission in the separate CG-SDT BWP, and when it is determined that the SDT transmission is completed, switch from the separate CG-SDT BWP to the initial BWP. For example, when the terminal remains in the inactive state even after the execution of the SDT transmission is completed, switch from the separate CG-SDT BWP to the initial BWP. For example, after the terminal receives the RRC release signaling, switch from the separate CG-SDT BWP to the initial BWP.

[0123] Examples of the present disclosure will be described by taking as an example the case where the terminal enters from the connected state into the inactive state and the target BWP to be switched is a separate CG-SDT BWP, determining the current BWP, performing TA validity determination, and performing SDT transmission. It should be noted that the following is only one possible embodiment, and the embodiments in other cases may be similar to the following embodiments.

[0124] In an example of the present disclosure, when the terminal enters from the connected state into the inactive state and the target BWP to be switched is a separate CG-SDT BWP, the terminal needs to be a terminal that supports SDT transmission, and a separate CG-SDT BWP is set for the terminal that supports SDT by protocol regulations or by the base station.

[0125] In an embodiment of an example of the present disclosure, according to communication protocol regulations, it is determined that the terminal always switches to a separate CG-SDT BWP when entering from the connected state into the inactive state. Or based on predefined conditions, it is determined that the terminal switches to a separate CG-SDT BWP when entering from the connected state into the inactive state. Or based on indication information, it is determined that the terminal switches to a separate CG-SDT BWP when entering from the connected state into the inactive state.

[0126] In response to the terminal entering from the connected state into the inactive state and switching to a separate CG-SDT BWP, when there is SDT transmission for the terminal, it is determined whether the TA is valid. If the TA is valid, SDT transmission based on quasi-static in the separate CG-SDT BWP is performed. If the TA is invalid, SDT transmission based on random access in the separate CG-SDT BWP or the initial BWP is performed.

[0127] In an embodiment of the present disclosure, when the terminal enters the inactive state from the connected state and switches to the separate CG-SDT BWP, different TA validity determination methods can be used based on whether the SSB is set in the separate CG-SDT BWP.

[0128] In one embodiment, in order to avoid frequent switching of the BWP, the protocol stipulates that one or more parameters among the SSB, paging message, system message, PRACH channel configuration, etc. must be set for the separate SDT BWP. Or the separate CG-SDT BWP must include the initial BWP within its bandwidth range, that is, the initial BWP must be included in the separate CG-SDT BWP.

[0129] In one embodiment, in response to the terminal entering the inactive state from the connected state, it is determined to switch to the separate CG-SDT BWP based on the communication protocol, predefined conditions, indication information, or others. The separate CG-SDT BWP includes the initial BWP, or one or more parameters among the SSB, paging message, system message, PRACH channel configuration, etc. are set in the separate SDT BWP. The terminal performs SSB measurement on the separate CG-SDT BWP or the active BWP, and uses the obtained parameter measurement value as the parameter reference value for later TA validity determination. Hereinafter, the parameter reference value is referred to as the third parameter reference value. In response to the terminal entering the inactive state, before performing SDT transmission, the parameter value of the same beam as the third parameter reference value is detected in the separate CG-SDT BWP. Hereinafter, it is referred to as the third parameter measurement value. Based on the third parameter reference value and the third parameter measurement value, it is determined whether the timing advance corresponding to the SDT transmission is valid.

[0130] As an example, the case where the parameter obtained by performing the SSB measurement is the RSRP will be described. Here, for the terminal to perform the SSB measurement in the separate CG-SDT BWP and determine the RSRP value used as the reference value, it may be performed before entering the inactive state, or may be performed simultaneously with or after entering the inactive state.

[0131] For example, before the terminal enters the inactive state, it switches to the separate CG-SDT BWP, performs the SSB measurement, and holds the obtained RSRP value as the reference value. The terminal enters the inactive state from the connected state and switches to the separate CG-SDT BWP. Before starting the SDT transmission, perform the SSB measurement in the separate CG-SDT BWP, and measure the RSRP value of the same SSB subset as that used during the measurement of the RSRP reference value as the measured value. Or, the terminal switches from the connected state to the inactive state, switches to the separate CG-SDT BWP, performs the SSB measurement in the separate CG-SDT BWP, and holds the obtained RSRP value as the reference value. Before the terminal starts the SDT, the terminal performs the SSB measurement again in the separate CG-SDT BWP, and measures the RSRP value of the same SSB subset as that used during the measurement of the RSRP reference value as the measured value.

[0132] The terminal determines whether the TA is valid by comparing the measured value with the reference value. Perform the SDT transmission on the premise that the TA is valid. Otherwise, check whether there are random access resources in the separate CG-SDT BWP on the premise that the SDT transmission conditions are met. If there are random access resources in the separate CG-SDT BWP, perform the SDT transmission based on random access in the separate CG-SDT BWP. If there are no random access resources in the separate CG-SDT BWP, switch to the initial BWP and perform the SDT transmission based on random access.

[0133] In another example, a case where the parameter obtained by performing SSB measurement is RSRP will be described as an example. Before the terminal enters the inactive state, first, perform SSB measurement in the activated BWP, and use the measured RSRP as a reference value. At the same time, the network device sets the measurement quantity such as the SSB beam, which is the same as the reference value, to a separate CG-SDT BWP through high-level signaling. That is, for the independent small data transmission BWP, the same beam measurement information as the beam used for measuring the third parameter reference value is set. After the terminal enters the active state, it switches to the separate CG-SDT BWP. When it is determined that SDT transmission is required, first, it is necessary to perform TA validity verification by measuring the corresponding SSB. On the premise that the TA is valid, SDT transmission is performed. Otherwise, on the premise that the SDT transmission conditions are met, it is checked whether there are random access resources in the separate CG-SDT BWP. If there are random access resources in the separate CG-SDT BWP, SDT transmission based on random access is performed in the separate CG-SDT BWP. If there are no random access resources in the separate CG-SDT BWP, it switches to the initial BWP and performs SDT transmission based on random access.

[0134] In one embodiment, a case where the parameter obtained by performing SSB measurement is RSRP will be described as an example. In the embodiments of the present disclosure, by stipulating that random access resources must be set in the separate CG-SDT BWP according to the communication protocol, it is possible to realize SDT transmission based on random access in the separate CG-SDT BWP.

[0135] Here, the terminal enters from the connected state to the inactive state, determines, by means of a communication protocol or instruction information or any other method, that the target BWP to which the terminal is to be switched is a separate CG-SDT BWP, and no SSB is set for the separate CG-SDT BWP. The terminal performs SSB measurement in the initial BWP or the active BWP, and uses the measured parameter value obtained by the measurement as the parameter reference value for later TA validity determination. Hereinafter, the parameter reference value is referred to as the fourth parameter reference value. Before performing SDT transmission, measure the parameter value of the same beam as the fourth parameter reference value in the initial BWP. Hereinafter, it is referred to as the fourth parameter measurement value. Based on the fourth parameter reference value and the fourth parameter measurement value, determine whether the timing advance corresponding to the SDT transmission is valid. In some embodiments, the above steps may be performed to determine the fourth parameter measurement value before performing SDT transmission after entering the inactive state.

[0136] In one example, the case where the parameter obtained by performing SSB measurement is RSRP will be described as an example. Here, the terminal may perform SSB measurement in the initial BWP to determine the RSRP value used as the reference value before entering the inactive state, or may perform it simultaneously with or after entering the inactive state.

[0137] For example, before the terminal enters the inactive state, it switches to the initial BWP to perform SSB measurement, and holds the obtained RSRP value as a reference value. The terminal enters the inactive state from the connected state and switches from the initial BWP to the separate CG-SDT BWP. When the terminal needs to perform SDT transmission, first, it switches from the separate CG-SDT BWP to the initial BWP, measures the RSRP value of the same SSB subset as that used during the measurement of the RSRP reference value, and uses the measured value. Alternatively, the terminal switches from the connected state to the inactive state, in the inactive state, switches to the initial BWP to perform SSB measurement, and holds the obtained RSRP value as a reference value. The terminal switches from the initial BWP to the separate CG-SDT BWP. Before starting SDT, the terminal switches from the separate CG-SDT BWP to the initial BWP again, performs SSB measurement in the initial BWP, measures the RSRP value of the same SSB subset as that used during the measurement of the RSRP reference value, and uses the measured value.

[0138] The terminal performs TA validity determination by comparing the measured value with the reference value. When TA is valid, it switches to the separate CG-SDT BWP to perform SDT transmission. When TA is invalid, when the conditions for SDT transmission based on random access are met, the terminal can perform SDT transmission based on random access in the initial BWP. Also, when random access resources are configured in the separate CG-SDT BWP, the terminal may switch to the separate CG-SDT BWP to perform SDT transmission based on random access.

[0139] In another example, a case where the parameter obtained by performing an SSB measurement is the RSRP will be described as an example. Before the terminal enters the inactive state, first, perform an SSB measurement in the activated BWP, and use the RSRP obtained by the measurement as a reference value. At the same time, the network device sets a measurement quantity such as an SSB beam that is the same as the reference value in the initial BWP through high-level signaling. That is, the network device sets the same beam measurement information as the beam used for measuring the reference value of the fourth parameter in the separate small data transmission BWP. After the terminal enters the inactive state, it switches to the separate CG-SDT BWP. When the terminal needs to perform SDT transmission, first, it switches to the initial BWP to perform TA validity determination. If the TA is valid, it switches to the separate CG-SDT BWP to perform SDT transmission. If the TA is invalid, when the conditions for SDT transmission based on random access are met, the terminal can perform SDT transmission based on random access in the initial BWP. Also, if random access resources are set in the separate CG-SDT BWP, the terminal may switch to the separate CG-SDT BWP to perform SDT transmission based on random access.

[0140] Note that the terminal according to the above embodiment of the present disclosure switching from the initial BWP to the separate CG-SDT BWP or from the separate CG-SDT BWP to the initial BWP may be that the terminal switches autonomously, or first the terminal reports a switching request and then performs the switching according to the instruction of the network device.

[0141] The BWP switching method applied to a terminal provided by an embodiment of the present disclosure may be understood as a BWP switching method when the terminal enters the non-active state from the connected state when a separate CG-SDT BWP is set in the terminal supporting SDT. It is possible to determine whether the target BWP to be switched is a separate CG-SDT BWP or an initial BWP. Thereby, the setting of the separate CG-SDT BWP is effectively supported, and the degree of convergence in the initial BWP is reduced.

[0142] Based on the same concept, an embodiment of the present disclosure further provides a BWP switching method applied to a network device.

[0143] FIG. 7 is a flowchart of a BWP switching method shown by an exemplary embodiment. As shown in FIG. 7, the BWP switching method is applied to a network device and includes the following steps.

[0144] In step S41, instruction information for instructing a target BWP to be switched when entering the non-active state from the connected state is transmitted, and the target BWP includes an initial BWP or a separate CG-SDT BWP.

[0145] In an embodiment of the present disclosure, the network device instructs whether to switch to the initial BWP or the separate CG-SDT BWP. Thereby, when a separate CG-SDT BWP is set in the terminal supporting SDT, the terminal enters the non-active state from the connected state, and it is possible to determine whether the target BWP to be switched is a separate CG-SDT BWP or an initial BWP. By effectively supporting the setting of the separate CG-SDT BWP in this way, the degree of convergence in the initial BWP is reduced.

[0146] In an embodiment of the present disclosure, the network device can further set beam information for performing SSB measurement on the terminal based on the target BWP to be switched as instructed and whether an SSB is set in the separate CG-SDT BWP set for the terminal. Thereby, the terminal can determine the TA effectiveness in SDT transmission.

[0147] In one embodiment, the target BWP includes the initial BWP, no SSB is set in the separate CG-SDT BWP, and the network device sets the same beam measurement information as the beam used for measuring the first parameter reference value in the initial BWP. The first parameter reference value is the parameter measurement value in the initial BWP or the active BWP.

[0148] In one embodiment, the target BWP to be switched includes the initial BWP, an SSB is set in the separate CG-SDT BWP, and the network device sets the same beam measurement information as the beam used for measuring the second parameter reference value in the separate CG-SDT BWP. The second parameter reference value includes the parameter measurement values in the initial BWP, the separate CG-SDT BWP, or the active BWP before entering the inactive state.

[0149] In one embodiment, the target BWP to be switched includes the separate CG-SDT BWP, the initial BWP is included in the separate CG-SDT BWP, or one or more parameters of the SSB, the paging message, the system message, and the random access channel configuration are set in the separate CG-SDT BWP. The network device sets the same beam measurement information as the beam used for measuring the third parameter reference value in the separate CG-SDT BWP. The third parameter reference value includes the parameter measurement values in the separate CG-SDT BWP or the active BWP before entering the inactive state.

[0150] In one embodiment, the target BWP to be switched includes a separate CG-SDT BWP, and no SSB is configured for the separate CG-SDT BWP. The network device sets the same beam measurement information as the beam used for measuring the fourth parameter reference value in the initial BWP, and the fourth parameter reference value includes the parameter measurement value in the initial BWP or the active BWP before entering the inactive state.

[0151] Note that since the BWP switching method executed by the network device in the embodiments of the present disclosure corresponds to the BWP switching method executed by the terminal in the above embodiments, if the description of the BWP switching method executed by the network device is insufficient, reference may be made to the BWP switching method executed by the above terminal, and detailed description is omitted here.

[0152] Furthermore, the BWP switching method provided by the embodiments of the present disclosure can be applied to a scenario where the terminal and the network device interact to realize BWP switching. Here, for the functions realized by the terminal and the network device related to the specific realization process, reference may be made to the related descriptions in the above embodiments, and detailed description is omitted here.

[0153] It should be understood by those skilled in the art that in the various related embodiments / examples of the embodiments of the present disclosure, they may be used in accordance with the foregoing embodiments or independently. Whether used independently or in accordance with the foregoing embodiments, their realization principles are similar. In the implementation of the present disclosure, some embodiments are described in terms of embodiments used together. Of course, as will be understood by those skilled in the art, listing examples in this way is not intended to limit the embodiments of the present disclosure.

[0154] Based on the same structure, the embodiments of the present disclosure further provide a BWP switching device.

[0155] Note that, in order to implement the above functions, the BWP switching device provided by the embodiments of the present disclosure includes corresponding hardware structures and / or software modules for executing each function. In accordance with each exemplary unit and step disclosed in the embodiments of the present disclosure, the embodiments of the present disclosure can be implemented in the form of hardware or a combination of hardware and computer software. Whether a specific function is executed in a hardware manner or in a manner in which computer software drives hardware depends on the specific application of the technical solution and the design constraints. Those skilled in the art can use different methods to implement the functions described, but such implementation should not be regarded as exceeding the scope of the technical solution of the embodiments of the present disclosure.

[0156] FIG. 8 is a block diagram of a BWP switching device shown by an exemplary embodiment. Referring to FIG. 8, the BWP switching device 100 is applied to a terminal and includes a processing unit 101.

[0157] In response to the initial BWP and the separate CG-SDT BWP being set for the terminal and being triggered to enter the non-active state from the connected state, the processing unit 101 determines the target BWP to be switched for the terminal, and the target BWP to be switched includes the initial BWP or the separate CG-SDT BWP and is configured to switch from the activated BWP to the target BWP.

[0158] In one embodiment, the processing unit 101 determines the target BWP to be switched for the terminal by at least one of the following methods: determining the target BWP to be switched for the terminal based on a communication protocol, determining the target BWP to be switched for the terminal based on predefined conditions, and determining the target BWP to be switched for the terminal based on instruction information for instructing the target BWP to be switched when entering the non-active state from the connected state.

[0159] In one embodiment, the target BWP that can be switched by the terminal is the initial BWP, and the processing unit 101 is further configured to determine that there is a small data packet to be transmitted, determine that the timing advance corresponding to SDT transmission is valid, switch from the initial BWP to the separate CG-SDT BWP, and perform SDT transmission based on quasi-static.

[0160] In one embodiment, no SSB is set in the separate CG-SDT BWP, and the processing unit 101 is configured to determine that the timing advance corresponding to SDT transmission is valid based on the first parameter reference value and the first parameter measurement value obtained by measuring the same beam as the first parameter reference value in the initial BWP after entering the non-active state. The first parameter reference value includes the parameter measurement value in the initial BWP or the active BWP before entering the non-active state.

[0161] In one embodiment, based on the communication protocol or the indication information, it is determined that the target BWP that can be switched by the terminal is the initial BWP, an SSB is set in the separate CG-SDT BWP, and the processing unit 101 is configured to determine that the timing advance corresponding to small data transmission is valid based on the second parameter reference value and the second parameter measurement value obtained by measuring the same beam as the second parameter reference value in the separate CG-SDT BWP or the initial BWP after entering the non-active state. The second parameter reference value includes the parameter measurement value in the initial BWP, the separate CG-SDT BWP, or the active BWP before entering the non-active state.

[0162] In one embodiment, the processing unit 101 is further configured to determine that the small data transmission is completed and switch from the separate CG-SDT BWP to the initial BWP.

[0163] In one embodiment, the target BWP that can be switched by the terminal is a separate CG-SDT BWP, and the processing unit 101 further determines that there is a small data packet to be transmitted, determines that the timing advance corresponding to small data transmission is valid, and is configured to perform small data transmission based on a quasi-static basis in the separate CG-SDT BWP.

[0164] In one embodiment, the initial BWP is included in the separate CG-SDT BWP, or one or more parameters among the SSB, paging message, system message, and random access channel configuration are set in the separate CG-SDT BWP. The processing unit 101 is configured to determine that the timing advance corresponding to small data transmission is valid based on the third parameter reference value and the third parameter measurement value obtained by measuring the same beam as the third parameter reference value in the separate CG-SDT BWP after entering the inactive state. The third parameter reference value includes the parameter measurement value in the separate CG-SDT BWP or the active BWP before entering the inactive state.

[0165] In one embodiment, based on the communication protocol or the indication information, it is determined that the target BWP that can be switched by the terminal is a separate CG-SDT BWP, and the SSB is not set in the separate CG-SDT BWP. The processing unit 101 is configured to determine that the timing advance corresponding to small data transmission is valid based on the fourth parameter reference value and the fourth parameter measurement value obtained by measuring the same beam as the fourth parameter reference value in the initial BWP after entering the inactive state. The fourth parameter reference value includes the parameter measurement value in the initial BWP or the active BWP before entering the inactive state.

[0166] In one embodiment, the processing unit 101 is further configured to determine that there is a small data packet to be transmitted, determine that the timing advance for small data transmission is invalid, and perform random access-based small data transmission in the initial BWP or the separate CG-SDT BWP.

[0167] In one embodiment, the processing unit 101 is configured to determine the target BWP to be switched of the terminal based on predefined conditions by at least one of the following methods: determining to switch to the separate CG-SDT BWP when the condition for switching to the separate CG-SDT BWP is met, or determining not to meet the condition for switching to the separate CG-SDT BWP and switching to the initial BWP. The condition for switching to the separate CG-SDT BWP includes that one or more parameters of the SSB, paging message, system message, and random access channel configuration are set in the separate CG-SDT BWP.

[0168] FIG. 9 is a block diagram of a BWP switching device shown by an exemplary embodiment. Referring to FIG. 9, the BWP switching device 200 is applied to a network device and includes a transmission unit 201.

[0169] The transmission unit 201 is configured to transmit instruction information for instructing the target BWP to be switched when entering from the connected state to the inactive state, and the target BWP includes the initial BWP or the separate CG-SDT BWP.

[0170] In one embodiment, the BWP switching device 200 further includes a processing unit 202, the target BWP includes the initial BWP, no SSB is set for the separate CG-SDT BWP, and the processing unit is configured to set the same beam measurement information as the beam used for measuring the first parameter reference value in the initial BWP, and the first parameter reference value is the parameter measurement value in the initial BWP or the active BWP.

[0171] In one embodiment, the BWP switching device 200 further includes a processing unit 202, the target BWP includes the initial BWP, an SSB is set for the separate CG-SDT BWP, and the processing unit 202 is configured to set the same beam measurement information as the beam used for measuring the second parameter reference value in the separate CG-SDT BWP, and the second parameter reference value includes the parameter measurement values in the initial BWP, the separate CG-SDT BWP, or the active BWP before entering the non-active state.

[0172] In one embodiment, the BWP switching device 200 further includes a processing unit 202, the target BWP includes the separate CG-SDT BWP, the separate CG-SDT BWP includes the initial BWP, or one or more parameters among the SSB, paging message, system message, and random access channel configuration are set for the separate CG-SDT BWP, and the processing unit 202 is configured to set the same beam measurement information as the beam used for measuring the third parameter reference value in the separate CG-SDT BWP, and the third parameter reference value includes the parameter measurement values in the separate CG-SDT BWP or the active BWP before entering the non-active state.

[0173] In one embodiment, the BWP switching device 200 further includes a processing unit 202, the target BWP includes a separate CG-SDT BWP, no SSB is set for the separate CG-SDT BWP, and the processing unit 202 is configured to set the same beam measurement information as the beam used for measuring the fourth parameter reference value to the initial BWP. The fourth parameter reference value includes the parameter measurement value in the initial BWP or the active BWP before entering the inactive state.

[0174] Regarding the device of the above embodiment, the specific manner in which each module executes the operation has been described in detail in the embodiments related to the method, and the detailed description is omitted here.

[0175] FIG. 10 is a block diagram of a BWP switching device shown by an exemplary embodiment. The BWP switching device 300 can be provided as the terminal according to the above embodiment. For example, the device 300 may be a mobile phone, a computer, a digital broadcast terminal device, a message transceiver device, a game console, a tablet terminal, a medical device, a fitness device, a personal digital assistant, etc.

[0176] Referring to FIG. 10, the device 300 can include one or more of a processing component 302, a memory 304, a power component 306, a multimedia component 308, an audio component 310, an input / output (I / O) interface 313, a sensor component 314, and a communication component 316.

[0177] The processing component 302 generally controls all the operations of the device 300, such as operations related to display, phone calls, data communication, camera operations, and recording operations. The processing component 302 can include one or more processors 320 for executing instructions to complete all or some of the steps of the above methods. Also, to facilitate interaction with other components, the processing component 302 can include one or more modules. For example, the processing component 302 can include a multimedia module to facilitate the interaction between the multimedia component 308 and the processing component 302.

[0178] The memory 304 is configured to store various types of data such as instructions of any application program or method, contact data, phone book data, messages, photos, videos, etc. that are operated on the device 300 to support the operations on the device 300. The memory 304 may be implemented by any type of volatile or non-volatile storage device such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk, optical disk, or a combination thereof.

[0179] The power component 306 provides power to various components of the device 300. The power component 306 can include a power management system, at least one power source, and components related to generating, managing, and allocating power to other devices 300.

[0180] The multimedia component 308 includes a screen that provides an output interface between the device 300 and the user. In some embodiments, the screen can include a liquid crystal display (LCD) and a touch panel (TP). When the screen includes a touch panel, the screen can be implemented as a touch screen to receive input signals from the user. The touch panel includes one or more touch sensors to sense touches, swipes, and gestures on the touch panel. The touch sensor detects not only the boundary of a touch or swipe operation but also the duration and pressure associated with the touch or swipe operation. In some embodiments, the multimedia component 308 includes one front camera and / or one back camera. When the device 300 is in an operation mode such as a shooting mode or a video mode, the front camera and / or the back camera can receive external multimedia data. Each front camera and back camera may be a fixed optical lens system or may have a focal length and an optical zoom capability.

[0181] The audio component 310 is configured to output and / or input audio signals. For example, the audio component 310 includes one microphone (MIC). When the device 300 is in an operation mode such as a calling mode, a recording mode, or a voice recognition mode, the microphone is configured to receive external audio signals. The received audio signals can be further stored in the memory 304 or transmitted via the communication component 316. In some embodiments, the audio component 310 further includes one speaker for outputting audio signals.

[0182] The I / O interface 313 provides an interface between the processing component 302 and a peripheral interface module, and the peripheral interface module may be a keyboard, click wheel, buttons, etc. These buttons can include, but are not limited to, a home button, volume buttons, start button, and lock button.

[0183] The sensor component 314 includes at least one or a plurality of sensors to provide state evaluations of various aspects for the device 300. For example, the sensor component 314 can detect the on / off state of the device 300 and the relative positioning of components. For example, the components are the display and keypad of the device 300, and the sensor component 314 can also detect position changes of the device 300 or components of the device 300, whether there is user contact with the device 300, the orientation or acceleration / deceleration of the device 300, and temperature changes of the device 300. The sensor component 314 can also include a proximity sensor configured to detect the presence of nearby objects in the absence of any physical contact. The sensor component 314 can further include an optical sensor such as a CMOS or CCD image sensor for use in imaging applications. In some embodiments, the sensor component 314 may also further include an acceleration sensor, gyro sensor, magnetic sensor, pressure sensor, or temperature sensor.

[0184] The communication component 316 is configured to facilitate wired or wireless communication between the device 300 and other devices. The device 300 can access a wireless network based on a communication standard, such as WiFi, 2G or 3G, or a combination thereof. In an exemplary embodiment, the communication component 316 receives a broadcast signal or broadcast-related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 316 further includes a Near Field Communication (NFC) module to facilitate short-range communication. For example, in the NFC module, it may be implemented based on Radio Frequency Identification (RFID) technology, Infrared Data Association (IrDA) technology, Ultra Wide Band (UWB) technology, Bluetooth (BT) technology, and other technologies.

[0185] In an exemplary embodiment, the device 300 may be implemented by at least one Application Specific Integrated Circuit (ASIC), Digital Signal Processor (DSP), Digital Signal Processing Device (DSPD), Programmable Logic Device (PLD), Field Programmable Gate Array (FPGA), controller, microcontroller, microprocessor, or other electronic components to execute the above method.

[0186] In an exemplary embodiment, a storage medium containing instructions is provided, for example, a memory 304 containing instructions, and the above instructions may be executed by a processor 320 of the device 300 to implement the above method. For example, the non-transitory computer-readable storage medium may be a ROM, Random Access Memory (RAM), CD-ROM, tape, floppy disk, and optical data storage device, etc.

[0187] FIG. 11 is a block diagram of a BWP switching device shown by an exemplary embodiment. For example, the BWP switching device 400 may be provided as one network device. Referring to FIG. 11, the device 400 includes a processing component 422, and further includes one or more processors and memory resources for storing instructions executable by the processing component 422, such as application programs, including a memory 432. The application programs stored in the memory 432 may each include one or more modules corresponding to a set of instructions. Also, the processing component 422 is configured to execute the above method to execute the above method.

[0188] The device 400 may further include one power component 426 configured to execute power management of the device 400, one wired or wireless network interface 440 configured to connect the device 400 to a network, and one input / output (I / O) interface 448. The device 400 can operate an operating system stored in the memory 432, such as Windows Server TM, Mac OS XTM, UnixTM, LinuxTM, FreeBSDTM or the like.

[0189] In an exemplary embodiment, a storage medium containing instructions is further provided. For example, a memory 432 containing instructions is provided, and the above instructions are executed by the processing component 422 of the device 400 to complete the above method. For example, the non-transitory computer-readable storage medium may be a ROM, a random access memory (RAM), a CD-ROM, a tape, a floppy disk, and an optical data storage device, etc.

[0190] Note that the "plurality" in the present disclosure refers to two or more, and the same applies to other quantifiers. "And / or" represents the relationship of the related objects, indicating that three types of relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. The symbol " / " usually represents that the related objects before and after are in an "or" relationship. Unless otherwise clearly indicated in the context, the singular forms of "a type", "the foregoing", and "said" include the plural forms.

[0191] Note that terms such as "first" and "second" are used to explain various information, but these information should not be limited to these terms. These terms are used to distinguish the same type of information from each other and do not represent a specific order or importance. In fact, the descriptions of "first", "second", etc. are completely interchangeable. For example, unless departing from the scope of the present disclosure, the first information may be called the second information, and similarly, the second information may be called the first information.

[0192] Furthermore, although the operations are described in a specific order in the drawings of the embodiments of the present disclosure, it should not be understood that these operations are to be performed in the specific order or sequence shown, or that all the operations shown are to be performed to obtain the desired result. In certain environments, multitasking and parallel processing may be advantageous.

[0193] After considering the specification and practicing the invention disclosed herein, those skilled in the art can easily imagine other embodiments of the present invention. The present disclosure attempts to cover any variations, uses, or adaptive changes of the present invention, and these variations, uses, or adaptive changes include the general principles of the present invention and the common general knowledge or commonly used technical means in the art not disclosed in the present disclosure. The specification and examples are regarded as merely illustrative, and the true scope and spirit of the present disclosure are pointed out by the following claims.

[0194] Note that the present disclosure is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A BWP switching method applied to a terminal, comprising: After entering the non-active state from the connected state, determining a target BWP to be switched, wherein an initial BWP and an independent small data transmission BWP are set in the terminal; Starting small data transmission with the target BWP; The step of determining the target BWP to be switched includes: After determining that one or more parameters among a synchronization signal block, a paging message, a system message, and a random access channel configuration are set in the independent small data transmission BWP, determining that the target BWP is the independent small data transmission BWP, and determining that there is a small data packet to be transmitted; A BWP switching method characterized by the above.

2. The BWP switching method further includes: Determining that the timing advance corresponding to the small data transmission is valid, and determining that the small data transmission is configured grant (CG) small data transmission, or Determining that the timing advance corresponding to the small data transmission is invalid, and determining that the small data transmission is small data transmission based on random access; The BWP switching method according to claim 1, characterized by the above.

3. The BWP switching method further includes: Determining that the small data transmission is completed, and switching from the independent small data transmission BWP to the initial BWP; The BWP switching method according to claim 1, characterized by the above.

4. The independent small data transmission BWP is not set with a synchronization signal block. Based on a first parameter reference value and a first parameter measurement value obtained by measuring the same beam as the first parameter reference value with the initial BWP after entering the non-active state, determining that the timing advance corresponding to the small data transmission is valid, wherein the first parameter reference value includes a parameter measurement value in the initial BWP or the active BWP before entering the non-active state, Determining that the timing advance corresponding to the small data transmission is valid; The BWP switching method according to claim 2, characterized by the above.

5. ​ The target BWP to be switched is an independent small data transmission BWP, wherein the terminal performs configured grant (CG) small data transmission using the independent small data transmission BWP, The BWP switching method according to claim 2, characterized in that.

6. The independent small data transmission BWP includes an initial BWP, Based on a third parameter reference value and a third parameter measurement value obtained by measuring the same beam as the third parameter reference value in the independent small data transmission BWP after entering the non-active state, determining that the timing advance corresponding to the small data transmission is valid, wherein the third parameter reference value includes a parameter measurement value in the independent small data transmission BWP or the active BWP before entering the non-active state, Determining that the timing advance corresponding to the small data transmission is valid, The BWP switching method according to claim 2, characterized in that.

7. The target BWP to be switched is an independent small data transmission BWP, and no synchronization signal block is set in the independent small data transmission BWP, Based on a fourth parameter reference value and a fourth parameter measurement value obtained by measuring the same beam as the fourth parameter reference value in the initial BWP after entering the non-active state, determining that the timing advance corresponding to the small data transmission is valid, wherein the fourth parameter reference value includes a parameter measurement value in the initial BWP or the active BWP before entering the non-active state, Determining that the timing advance corresponding to the small data transmission is valid, The BWP switching method according to claim 2, characterized in that.

8. The terminal performs small data transmission based on random access using the independent small data transmission BWP, The BWP switching method according to claim 2, characterized in that.

9. A BWP switching method applied to a network device, comprising: Transmitting instruction information for instructing a target BWP to be switched of a terminal triggered to enter from a connected state to a non-active state, wherein the target BWP includes an initial BWP or an independent small data transmission BWP, A BWP switching method characterized by the above.

10. The target BWP includes the initial BWP, and no synchronization signal block is set for the independent small data transmission BWP. The method includes: A step of setting the same beam measurement information as the beam used for measuring the first parameter reference value in the initial BWP, the first parameter reference value being a parameter measurement value in the initial BWP or the active BWP, further including the step of: The BWP switching method according to claim 9, characterized by the above.

11. The target BWP includes the initial BWP, and a synchronization signal block is set for the independent small data transmission BWP. The method includes: A step of setting the same beam measurement information as the beam used for measuring the second parameter reference value in the independent small data transmission BWP, the second parameter reference value including parameter measurement values in the initial BWP, the independent small data transmission BWP, or the active BWP before entering the non-active state, further including the step of: The BWP switching method according to claim 9, characterized by the above.

12. The target BWP includes the independent small data transmission BWP. The independent small data transmission BWP includes the initial BWP, or one or more parameters among the synchronization signal block, paging message, system message, and random access channel setting are set for the independent small data transmission BWP. The method includes: A step of setting the same beam measurement information as the beam used for measuring the third parameter reference value in the independent small data transmission BWP, the third parameter reference value including parameter measurement values in the independent small data transmission BWP or the active BWP before entering the non-active state, further including the step of: The BWP switching method according to claim 9, characterized by the above.

13. The target BWP includes the independent small data transmission BWP, and no synchronization signal block is set for the independent small data transmission BWP. The method includes: A step of setting the same beam measurement information as the beam used for measuring the fourth parameter reference value in an initial BWP, the step further including the fourth parameter reference value including a parameter measurement value in the initial BWP or the active BWP before entering the inactive state. The BWP switching method according to claim 9, characterized in that.

14. A BWP switching device, including a processing unit, The processing unit is configured to determine a target BWP to be switched after the terminal enters the inactive state from the connected state, set an initial BWP and an independent small data transmission BWP for the terminal, and start small data transmission with the target BWP. Determining the target BWP to be switched includes After determining that one or more parameters among a synchronization signal block, a paging message, a system message, and a random access channel setting are set in the independent small data transmission BWP, determining that the target BWP is the independent small data transmission BWP, and determining that there is a small data packet to be transmitted. A BWP switching device, characterized in that.

15. A BWP switching device, including a transmission unit, The transmission unit is configured to transmit instruction information for instructing a target BWP to be switched when entering the inactive state from the connected state, and the target BWP includes an initial BWP or an independent small data transmission BWP. A BWP switching device, characterized in that.

16. A BWP switching device, including a processor and a memory for storing instructions executable by the processor, The processor is configured to execute the BWP switching method according to any one of claims 1 to 8. A BWP switching device, characterized in that.

17. A BWP switching device, including a processor and a memory for storing instructions executable by the processor, The processor is configured to execute the BWP switching method according to any one of claims 9 to 13. A BWP switching device, characterized in that.

18. A non-transitory computer-readable storage medium storing instructions, wherein when the instructions in the storage medium are executed by a processor of a terminal, the terminal is caused to execute the BWP switching method according to any one of claims 1 to 8. A non-transitory computer-readable storage medium, characterized in that.

19. A non-transitory computer-readable storage medium storing instructions, wherein when the instructions in the storage medium are executed by a processor of a network device, the network device is caused to execute the BWP switching method according to any one of claims 9 to 13. A non-transitory computer-readable storage medium, characterized in that.

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